arm: mach-sc5xx: fix reset hang by sending EX4B before returning to bootrom - #96

System.IO.IOException: No space left on device : '/home/runner/_diag/Worker_20260609-030449-utc.log' at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset) at System.IO.Strategies.OSFileStreamStrategy.Write(ReadOnlySpan`1 buffer) at System.IO.Strategies.BufferedFileStreamStrategy.Flush(Boolean flushToDisk) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.Diagnostics.TextWriterTraceListener.Flush() at GitHub.Runner.Common.HostTraceListener.Write(String message) at GitHub.Runner.Common.HostTraceListener.WriteHeader(String source, TraceEventType eventType, Int32 id) at GitHub.Runner.Common.HostTraceListener.TraceEvent(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String message) at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String message) at GitHub.Runner.Common.Tracing.Trace(TraceEventType eventType, String message) at GitHub.Runner.Common.Tracing.Info(String message) at GitHub.Runner.Worker.Worker.RunAsync(String pipeIn, String pipeOut) at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args) System.IO.IOException: No space left on device : '/home/runner/_diag/Worker_20260609-030449-utc.log' at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset) at System.IO.Strategies.OSFileStreamStrategy.Write(ReadOnlySpan`1 buffer) at System.IO.Strategies.BufferedFileStreamStrategy.Flush(Boolean flushToDisk) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.Diagnostics.TextWriterTraceListener.Flush() at GitHub.Runner.Common.HostTraceListener.Write(String message) at GitHub.Runner.Common.HostTraceListener.WriteHeader(String source, TraceEventType eventType, Int32 id) at GitHub.Runner.Common.HostTraceListener.TraceEvent(TraceEventCache eventCache, String source, TraceEventType eventType, Int32 id, String message) at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String message) at GitHub.Runner.Common.Tracing.Trace(TraceEventType eventType, String message) at GitHub.Runner.Common.Tracing.Error(Exception exception) at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args) Unhandled exception. System.IO.IOException: No space left on device : '/home/runner/_diag/Worker_20260609-030449-utc.log' at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset) at System.IO.Strategies.OSFileStreamStrategy.Write(ReadOnlySpan`1 buffer) at System.IO.Strategies.BufferedFileStreamStrategy.Flush(Boolean flushToDisk) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.Diagnostics.TextWriterTraceListener.Flush() at System.Diagnostics.TraceSource.Flush() at GitHub.Runner.Common.Tracing.Dispose(Boolean disposing) at GitHub.Runner.Common.Tracing.Dispose() at GitHub.Runner.Common.TraceManager.Dispose(Boolean disposing) at GitHub.Runner.Common.TraceManager.Dispose() at GitHub.Runner.Common.HostContext.Dispose(Boolean disposing) at GitHub.Runner.Common.HostContext.Dispose() at GitHub.Runner.Worker.Program.Main(String[] args)